Seiko Prospex Diver Scuba SBDY123 (SBDY123). Current Prices, JDM Listings, Market Analysis
The Seiko Prospex Diver Scuba SBDY123 is a Japan domestic market release in Seiko's long-running Prospex dive line, a segment with consistent cross-border demand from collectors who track JDM-exclusive variants. The SBDY123 reference sits in the accessible tier of the Prospex catalog, which keeps it liquid and relatively straightforward to source. Tonbo tracks this model because the US-Japan price spread is measurable and the secondary market sees regular movement. At a current US median of $380, the SBDY123 price sits at a level where landed import math can work, depending on timing and condition.
Current US Market Value
The US median for the Seiko Prospex Diver Scuba SBDY123 SBDY123 is currently $380, with the middle 50 percent of transactions falling between $354 and $404. That is a reasonably tight interquartile range, suggesting pricing is relatively consistent among the sales captured. The comp pool here is small, with a sample size of two transactions sourced from eBay. The comp quality is rated 🟢 Verified, meaning the underlying sales have been reviewed and are considered representative, but two data points means the median should be read as directional rather than statistically definitive. As more transactions are recorded, the confidence band will narrow. For now, the $354 to $404 range is the most reliable anchor for what buyers are actually paying in the US market for the SBDY123.
Active JDM Listings
Japanese market activity on the SBDY123 is currently healthy. Six listings appeared on May 30 alone, spread across both flea market and retail shop channels, with asking prices ranging from roughly ¥67,000 to ¥86,900. That spread of nearly ¥20,000 within a single day of listings reflects the usual mix of private sellers, secondary dealers, and authorized-adjacent shop inventory. Condition disclosures vary, with at least two listings graded as new or excellent and several others listed without a condition rating.
- ¥67,000 on Yahoo Flea Market, listed as new
- ¥73,800 on Yahoo Flea Market, listed as new
- ¥72,900 on Yahoo Shop, graded excellent
- ¥69,520 on Yahoo Shop, condition unknown
- ¥86,900 on Yahoo Shop, condition unknown
The presence of multiple new-condition listings at the flea market level is worth noting. It often indicates either gray market overstocks or individuals reselling sealed purchases, which can be a positive signal for buyers who want to buy SBDY123 Japan with minimal condition risk.
Recent Alert History
No strict or opportunity alerts have fired for the SBDY123 in the past 90 days. That means no listings have triggered Tonbo's threshold filters for either a strong deal relative to US market value or a strict undercut of the verified comp range. The absence of alerts is not a red flag on the model itself. It more likely reflects the current alignment between Japanese asking prices and US market levels, where the spread has not opened wide enough to generate a clear signal. Buyers watching for a sharper entry point can monitor the Tonbo signals feed to catch any shift in that dynamic.
Japan vs. US Price Gap
At current rates, the lower end of Japanese listings sits around ¥67,000 to ¥69,520, which translates to roughly $440 to $460 at a 150 yen exchange rate before shipping, import fees, and any proxy service costs. That puts the total landed cost above the US median of $380 for most sourcing scenarios, which explains why no opportunity alerts have fired. The math can shift quickly if yen weakens further or if a below-average listing appears without the usual dealer markup. The primary risk on this model is comp thinness on the US side. With only two verified sales anchoring the $380 median, a single outlier transaction could move the reference price materially, so buyers should treat the current figure as a working estimate and revisit it as the sample grows. Anyone building a sourcing case should also account for the typical JDM sourcing risks around condition variance and return limitations when buying through Japanese platforms.
Get Real-Time Alerts for Seiko Prospex Diver Scuba SBDY123
If you want to be notified the moment a strong SBDY123 for sale listing appears in Japan, Tonbo's alert system tracks this reference continuously against verified US market data. Paid tiers with configurable alert thresholds are available at tonbomarket.com/pricing. For a free introduction to how Tonbo surfaces JDM deals and tracks models like the SBDY123, the newsletter at tonbomarket.com is the starting point. No hype, just market data when the numbers actually make sense.